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Filament lid replacement for 4L jars. With hydrometer and PC4-M10 connector. No drilling or anything needed just replace the lid.&nbsp;Compatible with following jars from Vtopmart: <a target="_blank" href="https://www.amazon.nl/dp/B08CKB2B12" rel="nofollow noopener">https://www.amazon.nl/dp/B08CKB2B12</a>Hygrometer: <a target="_blank" href="https://nl.aliexpress.com/item/1005003075779370.html" rel="nofollow noopener">https://nl.aliexpress.com/item/1005003075779370.html</a>You will also need PC4-M10 connectors and PTFE tube

drybox